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Programming with NASM / Re: combining multiple asm files, mouse position
« Last post by fredericopissarra on March 29, 2019, 03:30:32 PM »PS: Sorry for mistakes, if any, I am not from english speaking country.
I am not from an english speaking country as well (Brazil)...
Hi! I am Lukas and I have a problem, I am writing my own OS using NASM and my emulator in QEMU. I have my bootloader and i want to use that bootloader only to call function from other file to start all my OS because bootloader's width is only 512 bytes with 2 bytes for telling BIOS to boot from it. When I try %include "first.asm", compiler told me that he can't found first.asm which was in the same folder.
Did you try to declare the symbol as extern and link the object files? %include should work, but you can say to NASM where to find the include files with -I option...
Second is that I want to read a mouse position or mouse move ( how much it does move from previous position), I know that in application ( for example on MS-DOS ) it is do by using INT 33h, but I think that without another OS it won't work , so my question is how to do it ( I have USB mouse ).
INT 0x33 only works with there is a mouse driver installed (old MS-DOS), this is not part of ROM-BIOS. You have to deal with the keyboard controller (yep... both are serial devices) or directly with USB via the Platform Controller Hub memory mapped address space for this device (not easy)...
if you are confortable reading portuguese, I have an article showing how to do it...